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Old 08-24-2012, 07:21 PM
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Grubby Grubby is offline
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Join Date: Nov 2007
Location: Clayton, IN
Cobra Make, Engine: ERA 838
Posts: 1,126
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Duane, Patrick and Gary-

OK guys I am feeling the love.

I used the Holley tool to determine correct carb size. If I choose "mildly modified" and 6000 rpm redline I get 750cfm. If I choose "highly modified" I get 850cfm. Clearly this engine is on the edge and I suspect Holley would error on the small side to make the car the most drivable for your average guy that just bolts it on.

Holley Interactive Carburetor Selector

With the definitions below my engine could fit into highly modified except my compression is 10.45. That means Holley suggest a 850cfm.

"Mildly modified - performance camshaft, performance intake manifold, headers and ignition upgrade

Highly modified - aggressive camshaft, performance intake manifold, headers and ignition upgrade, aluminum/ported iron cylinder heads and 11:1 or higher compression"

There is a engine tuner locally that comes highly rec. I am going to drive over and see him this week and see what he thinks. I would gladly spend $100 to "fix" my 750 vs $600+ for a new 850.

Duane - I would love to call your QF guy, but I don't have cam specs to give him. Do you think he would be much help with the information I have given you guys? Engine build sheet shows ultra Dyne cam with 108 deg cam ICL. No idea on lift.

John
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